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st: Round CSS units to the nearest multiple of the scale factor

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Actors themed through CSS should ideally get sizes and positions that
conform to the "pixel grid". A notorious example is the panel that has a
height of 1.86em. On unchanged font settings and hidpi that translates to
55px, which leaves the workarea with "half pixels" that hidpi wayland
applications don't know how to fully cover.

If the requested height is a multiple of the scale factor, the workarea
and maximized applications can then work on full pixels.

Closes: https://gitlab.gnome.org/GNOME/gnome-shell/issues/91
This commit is contained in:
Carlos Garnacho 2019-03-23 16:33:58 +01:00 committed by Florian Müllner
parent 5be61bbb68
commit a540fe4130
1 changed files with 5 additions and 1 deletions
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6
src/st/st-theme-node.c
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@ -1136,10 +1136,14 @@ get_length_from_term_int (StThemeNode *node,
{
double value;
GetFromTermResult result;
int scale_factor;
result = get_length_from_term (node, term, use_parent_font, &value);
if (result == VALUE_FOUND)
*length = (int) (0.5 + value);
{
g_object_get (node->context, "scale-factor", &scale_factor, NULL);
*length = (int) ((value / scale_factor) + 0.5) * scale_factor;
}
return result;
}